Armchair



FIG. 1 is a perspective view of an armchair, showing my new design from the front, top and right side;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing in FIG. 7 is included for the purpose of illustrating environment of the design and forms no part of the claimed design. 

The ornamental design for an armchair, as shown and described. 